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Slight ligand modifications within multitopic linear hydroxamates promotes connectivity differences in Cu(ii) 1-D coordination polymers
Author(s)
Fugu, Mohammed B.
Coley, Joe
Dickinson, Isabella F.
Orton, James B.
Klooster, Wim
Gleeson, M. Paul
Jones, Leigh F.
Date Issued
August 28, 2021
Type
Article
Abstract
The novel multitopic ligandsN-hydroxy-4-((2-hydroxy-3-methoxybenzyl)amino)benzamide (L3H3) andN-hydroxy-4-((2-hydroxybenzyl)amino)benzamide (L4H3) have been synthesised through the Schiff base coupling and subsequent reduction of 4-aminophenylhydroxamic acid and eithero-vanillin (to give L3H3) or 2-hydroxybenzaldehyde (to give L4H3). These linear multitopic ligands bind Cu(ii) centres at both the hydroxamate and phenol ends to form the 1-D coordination polymers [Cu(ii)(L3H2)2]n(1) and {[Cu(ii)(L4H2)2]·2MeOH}n(2). Slight differences in the structures of L3H3and L4H3lead to significant extended connectivity changes upon Cu(ii) metalation that are exampled by a 27% decrease in intra-chain Cu(ii)⋯Cu(ii) distance upon moving from1to2. The significant conformation and metal binding differences shown by L3H2−and L4H2−in1and2respectively have been rationalised using density functional theory (DFT) calculations. Hirshfeld surface analysis has been employed to assess and visualise the intra- and intermolecular interactions in both complexes.
Citation
Crystengcomm, 23(32), 5531-5539, 2021